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Q: What is amperage rating of thhn 450 MCM copper wire?

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#1 MCM copper wire is rated at 140 amps.

600amps

#1 copper thhn

It depends on a lot of factors. Generally speaking, if the insulation is THHN then the rating is 350 amps. If the insulation is THWN then the rating is 310 amps. The ampere rating for wire depends on the temperature of the environment it will be used in, the insulation rating and the number of circuits installed in a conduit. There are also other factors to consider... like voltage drop in long runs.

I would need more detailon your question but what i can tell you is 100' of #10 THHN eire is 8320grams with insulation and 7110 grams as bear copper wire. Now what i am trying to figure out is if that copper wire is 100% copper or not?

A #3 copper wire with insulation rating of 90 degrees C has an amperage rating of 105 amps.

NEC 310.16 #1 THHN Copper

#3 R90 or RW 90 degree copper wire. Its amperage rating is 105 amps.

500kciml has been rated as 380A (for connection to non-ANSI protective devices)

20 Amperes per NEC A #12 copper wire, insulation rating of 90 degree C, has an amperage rating of 20 amps.

A #8 copper wire insulation rating of 90 degrees C is rated at 45 amps. At 75 C = 45 amps, at 60 C = 40 amps.

THHN wire has two temperature ratings. 90 degrees C in dry locations and 75 degrees C in wet locations.

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